Sprinklers will be permanently switched off during winter from next year after the State Government today to retain this year’s trial sprinkler ban.

Yesterday’s decision follows a two-month trial ban during July and August, which Water Minister Graham Jacobs said saved about 2.2 billion litres of water, equivalent to filling 880 Olympic-sized pools and enough to supply towns the size of Manjimup or Collie for a year.

The permanent ban will apply from June 1 to August 31.

The trial ban – for most scheme users south of Kalbarri – was introduced after water usage earlier this winter was running at 800 million litres a day, 300 million litres above average.

Dr Jacobs said today that the ban saved 50 million litres a day, while an independent survey last month indicated 93 per cent of residents supported the move.

“This is an outstanding community achievement because while there has been reasonably consistent rain, we are still well below the long-term annual rainfall average,” Dr Jacobs said

Dams were now at 45.5 per cent of capacity, their second-highest level this decade. They are holding 19 per cent more water than the same time last year.

Water Corporation figures show rainfall in all but one of the catchments for dams supplying Perth are below their historical averages for the year-to-date.

Dr Jacobs said the exact area of the permanent ban, and any adverse impact for industry and local government users would still have to be worked out.

This would occur “soon”, and some areas that took part in the trial ban – which ran from Kalbarri to Esperance and east to Kalgoorlie-Boulder – could have a case to be excluded.

These users were asked to voluntarily stop using bores during the two-month ban period, while garden bore users were allowed to turn them on for maintenance reasons.

“A lot of people say garden bores are not pulling on the scheme, but we all realise our underground water resources are all related,” Dr Jacobs said last month.

The latest in a series of destructive cold fronts slammed into WA overnight, causing destructive winds, rain and hail storms.

The Bureau of Meteorology issued a severe weather warning at 6.45am, following similar warnings issued throughout the weekend.

Waves from the Swan River are washing onto the Kwinana Freeway north of Canning Highway citybound. There is also flooding on Beaufort Street in Inglewood heading into the city and on Riverside Drive.

Traffic lights are blacked out at the Great Eastern Highway and Bolton Road intersection in Burswood.

The front is the most severe of a series that have descended on WA over the past few days.

A wind gust of 115kmh was recorded at Rottnest Island about 6am today, and the Bureau is warning people to expect winds up to 100kmh with potentially damaging gusts reaching 125kmh this morning.

Alex Krisman from WeatherZone said Cape Naturaliste (109kmh) and Cape Leeuwin (104kmh) also recorded heavy gusts of wind – which coincided with a line of lightning flashes- at the same time as Rottnest Island.

Winds at Perth Airport hit 83kmh while the Perth metropolitan area clocked speeds up to 72kmh at 5.50am.

Rainfall was heavy, particularly across the south west. So far, Bridgetown has had 32mm from 9am yesterday morning.

Thunderstorms and heavy showers are forecast for today, particularly over the Lower West, South-West and South Coastal districts.

Abnormally high tides are set to cause flooding in low-lying coastal areas.

A gale warning has been issued from Kalbarri right through to the South Australian border.

Surfers are being warned to brace for heavy conditions, which are likely to cause significant beach erosion.

The State Emergency Service has warned people to secure loose objects, move vehicles under cover and stay inside away from windows.

People caught outdoors should find shelter away from trees, powerlines, storm water drains and streams. Boat owners should make sure their boats are securely moored.